/*
 * Copyright 2006-2008 Michele Mostarda ( michele.mostarda@gmail.com ).
 * All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the 'License');
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an 'AS IS' BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.graphnav.aggregator.model.impl;

import org.graphnav.aggregator.model.Relation;

/**
 * Defines a filesystem relation.
 */
public class FSRelation extends Relation {

    /**
     * Constructor.
     * 
     * @param fromNode
     * @param toNode
     */
    public FSRelation(FSResource fromNode, FSResource toNode) {
        super(fromNode, toNode);
    }

    public boolean equals(Object obj) {
        if(obj == null ) {
            return false;
        } else if(obj == this) {
            return true;
        } else if(obj instanceof FSRelation) {
            FSRelation other = (FSRelation) obj;
            return getFromNode().equals(other.getFromNode()) && getToNode().equals(other.getToNode());
        }
        return false;
    }

    public int hashCode() {
        return 2 * getFromNode().hashCode() + 3 * getToNode().hashCode();
    }
}
